CH-640
Group 1 metals
Chemistry · Secondary 3 · Medium · Group 1 metals
The first ionisation energy of potassium is lower than that of sodium. Which reason best explains this trend down Group I?
- Outer electron of potassium is further from the nucleus and more shielded
- Potassium has fewer protons than sodium
- Potassium has a completely filled outer shell
- Potassium atoms are smaller than sodium atoms
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